System Designer (XLS)
This template will help you size your system.  It includes a load calculation table, a derate table, and system design summary.

Bill of Materials (XLS)
This template will help you determine what equipment you need to purchase.


Solar Insolation Map

Declination Map








Voltage Drop Calculator (external link)

Solar Insolation Maps by Country (external link)
Find a more detailed solar insolation map for your region

GOGLA Photovoltaics for Productive Use Applications: A Catalogue of DC-Appliances (PDF)
List of DC equipment that works with batteries or solar PV